The Ca__(p,[alpha])Sc__ reaction
Youngblood, D. H. (Dave Harper), 1939-
Phillips, Gerald C.
Master of Arts
The elastic scattering of protons from Ca40 by Brown and Class1 revealed many interesting features of the level structure of Sc-41 Comparison of these results and those of Buechner2 on Ca41 showed many similar features. However there were still many levels observed in the Ca41 nucleus that had not been found in Sc41. To supplement the elastic scattering data, particularly for the narrow states which might be missed in the elastic scattering, the Ca4o (p)Sc41 reaction was studied. Due to the low yield expected, the beta decay of the ground state of Sc41 was detected instead of the gamma radiation, and a pulsed beam technique was used to reduce the background. A telescope counting system was devised which utilized two counters in coincidence to assure that all events came from the target. By a separate experiment the efficiency of this counting arrangement was determined, which permitted the determinations of absolute yields and hence of absolute cross sections. An excitation function was obtained from 600 keV to 5 MeV bombarding energy. The partial widths for gamma decay and upper limits on the total widths, as well as the energies for 19 states of Sc41 between 600 keV and 4.0 MeV were determined. In addition the energies of 43 states between 600 keV and 5 MeV were determined. The Ca40 (p )Sc41 reaction also provided a method of obtaining Sc41 in order to measure the half life of its beta decay. This was done and the result obtained was .603± .005 seconds.